CN106544457B - The CO utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system and method - Google Patents
The CO utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system and method Download PDFInfo
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- CN106544457B CN106544457B CN201610980162.5A CN201610980162A CN106544457B CN 106544457 B CN106544457 B CN 106544457B CN 201610980162 A CN201610980162 A CN 201610980162A CN 106544457 B CN106544457 B CN 106544457B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a kind of CO utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system and method；The CO utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system, including：Granulation unit, CO2Absorbing unit, desorption unit, clinker grind unit, clinker recycling unit, the first air preheater, the second air preheater and gas preheater；It is characterized in that：CO2The adsorbent import of the adsorbent outlet connection desorption unit of absorbing unit, CO2The adsorbent outlet of the adsorbent import connection desorption unit of absorbing unit；CO2Absorbing unit sets gas inlet, CO2The exhanst gas outlet of absorbing unit connects the second air preheater air inlet；CO2The zeolitic material outlet of the second adsorbent import connection clinker recycling unit of absorbing unit；The air inlet connection clinker of desorption unit grinds the air outlet of unit, the air inlet of the air outlet connection gas preheater of desorption unit；The present invention can be extensively using the energy-saving and emission-reduction with field of iron and steel smelting.
Description
Technical field
The present invention relates to blast furnace slag waste heat recovery system and methods, and in particular to based on blast furnace slag waste heat recycling and slag charge profit
CO2Emission-reducing system and method.
Background technology
Steel and iron industry is one of energy height intensity industry.Every year, energy expenditure accounts for the 5-6% of world's total energy consumption,
Its CO simultaneously2Discharge accounts for world CO2The 5-7% always discharged.The a large amount of CO discharged in steel smelting procedure2Exacerbate global warming
And climate change.Such as need to consume coke, the substantial amounts of carbon source such as coal in blast furnace ironmaking process, the carbon in carbon source finally with
CO2Form be discharged into air, in blast furnace produce the 1t pig iron CO2Discharge capacity is about 1.9t.Therefore, smelting iron and steel mistake is reduced
The CO of journey2It discharges extremely urgent.At the same time, by-product-blast furnace of a large amount of high-temperature fusions is generated in blast furnace ironmaking process
Slag, blast furnace slag are by the gangue in ore, the non-volatilization component in the ash content and flux in fuel, blast furnace cinder main component
CaO、 SiO2、A12O3、Fe2O3、MgO、MnO、TiO2Deng.About 7.12 hundred million t of China's pig iron yield in 2014, conservative estimation are often given birth to
It produces the 1t pig iron and generates 0.3t slags, then blast furnace slag yield is about 2.136 hundred million t.About l500 DEG C of the tapping temperature of blast furnace slag, 1t blast furnaces
Heat contained by slag is equivalent to 64kg standard coals, and the heat in the blast furnace slag that whole year generates is equivalent to 1.367 × 107T standards
Coal, if it is possible to the Btu utilization in blast furnace slag get up, considerable economic benefit can be generated.
Traditional Treating Methods for BF Slag is to realize that the material of blast furnace slag utilizes using water quenching technology, is with substantial amounts of cold
Water, which carries out high-temperature slag chilling, to be made slag be broken into particle and forms the blast furnace slag after water quenching, can be used to be added to clinker
In, produce Portland cement.However this method, there are many shortcoming, not only the sensible heat of blast furnace slag can not recycle, Er Qiezao
Into a large amount of wastes of water resource, serious pollution can also be generated to big gas and water and soil.In order to which many of Water Quenching is overcome to lack
Point, multidigit researcher propose the blast furnace residues processing technique of dry granulation combination waste heat recovery, can recycle the heat in blast furnace slag
Amount, obtains the slag particle of high vitreum content, with respect to water quenching technology more energy conservation and environmental protection.
But the blast furnace slag material needs in the dry type waste heat reclaiming process proposed at this stage transport cement manufacturing facility, this
Transportation cost is added in the process.For local use blast furnace slag material, fixed smelting iron and steel can be prepared using blast furnace slag
CO in the process2Required material, while realize blast furnace slag heat recycling, material utilization and CO2The purpose of emission reduction.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of CO utilized based on blast furnace slag waste heat recycling and slag charge2
Emission-reducing system and method.
First technical solution according to the present invention, the CO utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system,
Including：Granulation unit, CO2Absorbing unit, desorption unit, clinker grind unit, clinker recycling unit, the first air
Preheater, the second air preheater and gas preheater；
The bottom input fluidized wind of granulation unit, the slag notch of granulation unit are connected with the slag inlet of desorption unit；Grain
Change unit for being crushed, being granulated to blast furnace slag, after obtained blast furnace solid impurity particle exchanges heat with fluidized wind, blast furnace solid impurity particle is discharged into
Desorption unit provides desorption institute calorific requirement for desorption unit；
Its main feature is that：
CO2The adsorbent import of the adsorbent outlet connection desorption unit of absorbing unit, CO2The adsorbent of absorbing unit
Import connects the adsorbent outlet of desorption unit；CO2Absorbing unit sets gas inlet, CO2The exhanst gas outlet of absorbing unit connects
Connect the second air preheater air inlet；CO2The boiling of the second adsorbent import connection clinker recycling unit of absorbing unit
Stone material exports；
The air inlet connection clinker of desorption unit grinds the air outlet of unit, the air outlet connection combustion gas of desorption unit
The air inlet of preheater；The gas outlet of desorption unit connects the air inlet of the first air preheater；Desorption unit is slagged tap
The slag inlet that mouth grinds unit with clinker is connected；Desorption unit is provided with waste outlet, excludes deactivated zeolite；
Clinker grinds unit and is provided with air intlet, and clinker grinds the slag notch of unit and clinker recycling unit
Feed inlet connects；Clinker recycling unit is provided with precipitation of calcium carbonate outlet；
First air preheater is provided with air inlet, the air outlet connection hot-blast stove gas burner of the first air preheater into
Air port；The air inlet of the gas outlet connection clinker recycling unit of first air preheater；
Second air preheater is provided with air inlet, the air outlet connection hot-blast stove gas burner of the second air preheater into
Air port；Discharge clean flue gas in the gas outlet of second air preheater；
Gas preheater is provided with fuel gas inlet, the combustion gas of the gas outlet connection hot-blast stove gas burner of gas preheater into
Mouthful, the air inlet of the air outlet connection hot-blast stove gas burner of gas preheater, hot-blast stove gas burner provides high-temperature gas mixture to heat
Wind furnace.
The clinker recycling unit is used to clinker powder zeolite is made, and zeolite is as CO2Adsorbent passes through boiling
CO is sent into stone material outlet2Absorbing unit, to adsorb the CO in flue gas2；CO2Absorbing unit utilizes CO2Adsorbent adsorbs flue gas
In CO2, and CO will be adsorbed with2Adsorbent be sent into desorption unit and release CO2Absorption, clean flue gas are discharged to the second air
Preheater is passed through the air heat-exchange of hot-blast stove gas burner with preparation, makes the air themperature rise for being passed through hot-blast stove gas burner, into one
Step utilizes the thermal energy in flue gas；Desorption unit is to having CO2Adsorbent desorption, relieve CO2The adsorbent of absorption returns again
Return CO2Absorbing unit so cycles, loses CO2The zeolite of adsorption function is discharged by the desorption unit；What desorption generated
Rich CO2Gas is discharged to the air heat-exchange that the first air preheater is passed through hot-blast stove gas burner with preparation, makes to be passed through hot-blast stove combustion
The air themperature rise of burner, further utilizes the thermal energy in gas；Rich CO after heat exchange2Gas is sent into clinker recycling
After unit is utilized, remainder is rejected to external purification by other means, stores, utilizes.
The CO according to the present invention utilized based on blast furnace slag waste heat recycling and slag charge2The preferred embodiment of emission-reducing system,
Clinker recycling unit includes calcium dissolvers, hydrothermal conversion device, carbonizer；Organic acid is housed in calcium dissolvers；
The slag notch that clinker grinds unit is connected with the feed inlet of calcium dissolvers, and the discharge port connection hydro-thermal of calcium dissolvers turns
Change the feed inlet of device, the inlet of the liquid outlet connection carbonizer of calcium dissolvers；Equipped with alkaline solution, such as hydrogen in hydrothermal conversion device
Sodium oxide molybdena, potassium hydroxide solution etc.；The discharge port connection CO of hydrothermal conversion device2Second adsorbent import of absorbing unit；Carbonization
Equipped with alkaline solution, such as sodium hydroxide solution, potassium hydroxide solution in device；The gas outlet connection CO of carbonizer2Range site；
The air inlet of carbonizer connects the gas outlet of the first air preheater.
The CO according to the present invention utilized based on blast furnace slag waste heat recycling and slag charge2The preferred embodiment of emission-reducing system,
CO2Absorbing unit includes CO2Adsorptive reactor and the first cyclone separator；Desorption unit includes cooling of furnace slag burner hearth, CO2Solution
Adsorptive reactor, this reactor use from fluidized bed and carry out desorption reaction enclosure；CO2Desorption reactor is arranged on cooling of furnace slag burner hearth
It is interior；First cyclone separator is arranged on CO2At the gas outlet of adsorptive reactor.
The present invention second technical solution be：The CO utilized based on blast furnace slag waste heat recycling and slag charge2Discharge-reducing method,
Its main feature is that：Include the following steps：
Step 1 crushes blast furnace slag, is granulated, and obtains blast furnace solid impurity particle；Blast furnace solid impurity particle is changed with fluidized wind
Heat obtains the first high-temperature gas；The air of first high temperature is transported in hot-blast stove gas burner.
Blast furnace solid impurity particle after heat exchange is discharged into desorption unit by step 2, is provided for desorption unit hot needed for desorption
Amount；
Blast furnace solid impurity particle after cooling is discharged to clinker and grinds unit by step 3；
Step 4, clinker grind unit and blast furnace solid impurity particle are milled into powder, are discharged in clinker recycling unit；
Blast furnace slag powder is converted into zeolite and solid-state calcium carbonate by clinker recycling unit, and zeolite is transported to CO2Absorption is single
Member；
Pending flue gas is discharged into CO by step 52Absorbing unit, zeolite adsorb the CO in pending flue gas2Afterwards, clean flue gas
The second air preheater is output to, with being discharged after the air heat-exchange in the second air preheater, the second air preheater heat outputting
Air is to hot-blast stove gas burner；It is adsorbed with CO2Zeolite be output to desorption unit；
Step 6 provides thermal energy needed for desorption using blast furnace solid impurity particle for desorption unit, is adsorbed with CO2Zeolite exist
CO is released in desorption unit2Absorption, relieves CO2The zeolite of absorption returns to CO2Absorbing unit recycles；CO2Desorb coupon
Member exports hot-air to gas preheater；The rich CO that desorption unit generates2Gas changes in the first air preheater with air
Heat；Rich CO after heat exchange2Gas is passed through in clinker recycling unit, and the first air preheater exports hot-air to hot-blast stove
Burner；
Combustion gas is inputted gas preheater, CO by step 72The hot-air of desorption unit output exchanges heat with combustion gas, will preheat
Combustion gas and hot-air be output to hot-blast stove gas burner；The high-temperature gas mixture that hot-blast stove gas burner generates is sent into hot-blast stove.
The CO according to the present invention utilized based on blast furnace slag waste heat recycling and slag charge2The preferred embodiment of discharge-reducing method,
Clinker recycling unit includes calcium dissolvers, hydrothermal conversion device, carbonizer；Organic acid is housed in calcium dissolvers；
The rich CO that desorption unit generates2Gas in the first air preheater with air heat-exchange；Rich CO after heat exchange2Gas
Body is passed through in carbonizer；Clinker grinds unit and blast furnace solid impurity particle is milled into powder, is discharged to and is marked with certain density organic acid
Calcium dissolvers in, after blast furnace slag powder and organic acid react, calcium ion is extracted out, the leachate conveying of calcium ions
The carbonization of calcium ion is completed into carbonizer；The solid residues that the remaining oxide by magnesium, aluminium, silicon etc. forms are transferred to hydro-thermal
In converter；
Alkaline solution is added into hydrothermal conversion device, solid residues react in the hydrothermal conversion device with alkaline solution gives birth to
Into zeolite, using zeolite as CO2Adsorbent is transported to CO by zeolitic material outlet2Absorbing unit；
Alkaline solution is added in into the carbonizer；Alkaline solution and the leachate of calcium ions reaction after, then with CO2Gas
Precursor reactant completes the carbonization of calcium ion, forms the solid-state calcium carbonate of recycling.
The CO of the present invention utilized based on blast furnace slag waste heat recycling and slag charge2The advantageous effect of emission-reducing system and method
It is：The present invention not only high efficiente callback heat of blast furnace slag by way of cascaded utilization of energy, but also solve desorption adnexa
Origin of heat；The present invention also provides a kind of methods of local use blast furnace slag, and blast furnace slag is prepared into zeolitic material and is consolidated
State calcium carbonate, zeolitic material is as CO2Adsorbent not only realizes high value added utilization, also saves what material transported outward
Transportation cost；While blast furnace slag heat high efficiente callback and material high value added utilization is realized, also subtracted by way of absorption
The CO lacked2Gas discharges, and has good environmental benefit and economic benefit.
Description of the drawings
Fig. 1 is the structural representation of the CO2 emission-reducing systems of the present invention utilized based on blast furnace slag waste heat recycling and slag charge
Figure.
Fig. 2 is CO of the present invention2Absorbing unit conciliates the structure diagram of absorbing unit.
Fig. 3 is the schematic diagram of clinker recycling unit 6 of the present invention.
Specific embodiment
Referring to Fig. 1 to Fig. 3, a kind of CO utilized based on blast furnace slag waste heat recycling and slag charge2 Emission-reducing system, including：Granulation
Unit 3, CO2It is pre- that absorbing unit 4A, desorption unit 4B, clinker grind unit 5, clinker recycling unit 6, the first air
Hot 7 and second air preheater 8 of device, gas preheater 17, hot-blast stove gas burner 18 and hot-blast stove 19；
The bottom input fluidized wind of granulation unit 3, the slag notch of granulation unit 3 connect with the slag inlet of desorption unit 4B
It connects；Granulation unit 3 is for crushing blast furnace slag, being granulated, after obtaining blast furnace solid impurity particle and exchanging heat with fluidized wind, blast furnace slag
Grain is discharged into desorption unit 4B, and desorption institute calorific requirement is provided for desorption unit 4B；
CO2The adsorbent import of the adsorbent outlet connection desorption unit 4B of absorbing unit 4A, CO2Absorbing unit 4A's
The adsorbent outlet of adsorbent import connection desorption unit 4B；CO2Absorbing unit 4A sets gas inlet, CO2Absorbing unit 4A
Exhanst gas outlet connection 8 air inlet of the second air preheater；CO2The second adsorbent import connection clinker resource of absorbing unit 4A
Change the discharge port of range site 6；
CO2The adsorbent import of the adsorbent outlet connection desorption unit 4B of absorbing unit 4A, CO2Absorbing unit 4A's
The adsorbent outlet of adsorbent import connection desorption unit 4B；CO2Absorbing unit 4A sets gas inlet, CO2Absorbing unit 4A
Exhanst gas outlet connection 8 air inlet of the second air preheater；CO2The second adsorbent import connection clinker resource of absorbing unit 4A
Change the zeolitic material outlet of range site 6；
The air inlet connection clinker of desorption unit 4B grinds the air outlet of unit 5, and the air outlet of desorption unit 4B connects
Connect the air inlet of gas preheater 17；The gas outlet of desorption unit 4B connects the air inlet of the first air preheater 7；Desorption
The slag inlet that the slag notch of unit 4B grinds unit 5 with clinker is connected；Desorption unit 4B is provided with waste outlet；
Clinker grinds unit 5 and is provided with air intlet, and clinker grinds the slag notch of unit 5 and clinker recycling unit
6 feed inlet connection；Clinker recycling unit 6 is provided with precipitation of calcium carbonate outlet；
First air preheater 7 is provided with air inlet, the air outlet connection hot-blast stove gas burner 18 of the first air preheater 7
Air inlet；The air inlet of the gas outlet connection clinker recycling unit 6 of first air preheater 7；
Second air preheater 8 is provided with air inlet, the air outlet connection hot-blast stove gas burner 18 of the second air preheater 8
Air inlet；Discharge clean flue gas in the gas outlet of second air preheater 8；
Gas preheater 17 is provided with fuel gas inlet, the gas outlet connection hot-blast stove gas burner 18 of gas preheater 17
Fuel gas inlet, the air inlet of the air outlet connection hot-blast stove gas burner 18 of gas preheater 17, hot-blast stove gas burner 18 provide height
Warm gaseous mixture is to hot-blast stove 19.
In a particular embodiment, clinker recycling unit 6 includes calcium dissolvers, hydrothermal conversion device, carbonizer；Calcium is molten
It solves in device and acetic acid etc. may be employed equipped with organic acid, organic acid.
The slag notch that clinker grinds unit 5 is connected with the feed inlet of calcium dissolvers, the discharge port connection hydro-thermal of calcium dissolvers
The feed inlet of converter, the liquid mouth of the liquid outlet connection carbonizer of calcium dissolvers；In into hydrothermal conversion device equipped with concentration for 2.0~
The sodium hydroxide or potassium hydroxide solution of 8.0g/L；The discharge port connection CO of hydrothermal conversion device2The second absorption of absorbing unit 4A
Agent import；Equipped with the sodium hydroxide or potassium hydroxide solution that concentration is 2.0~8.0g/L in carbonizer；The gas outlet of carbonizer connects
Connect the air inlet of desorption unit 4B；The air inlet of carbonizer connects the gas outlet of the first air preheater 7.
In a particular embodiment, CO2Absorbing unit 4A includes CO29 and first cyclone separator 10 of adsorptive reactor；Desorption
Coupon member 4B includes cooling of furnace slag burner hearth 11 and CO2Desorption reactor 12；CO2Desorption reactor 12 is arranged on cooling of furnace slag
In burner hearth 11；First cyclone separator 10 is arranged on CO2At the gas outlet of adsorptive reactor 9.
It is using air as the cooled hearth of fluidizing agent in the cooling of furnace slag burner hearth；The heat come out from granulation unit 3 is empty
Gas is directly fed to participate in combustion reaction in hot-blast stove gas burner；Partial heat in the cooling of furnace slag burner hearth passes through described
CO2The wall surface of desorption reactor is transferred to the CO2Desorption inside reactor provides required heat of reaction for desorption,
The CO2Desorption inside reactor is the adsorbent accumulated from fluidized bed, and top, which is provided with, is adsorbed with CO2Adsorbent import,
Top is provided with CO2Gas inlet device 13.
The CO2In adsorptive reactor, adsorbent adsorbs the CO in flue gas under the fluidisation of flue gas2Gas, after absorption
Clean flue gas is by being placed in the CO2One end outflow of the first cyclone separator in adsorptive reactor, the first cyclone separator
The other end is adsorbent import.
The present invention is divided into four flows：Slag flow, adsorbent flow, air flow, CO2Flow and fuel gas flow path.
Slag flow is：Storage slag device 1 is connected to the clinker quality regulation and control unit 3 by noting slag pipe 2, forms the blast furnace of solid phase
Slag；The slag granules of high temperature are fluidized by slag-transporting pipe into the cooling of furnace slag burner hearth 11 by bubbling bed, by heat transfer
To the CO2Desorption reactor 12 provides CO for it2The heat of desorption, subsequent slag granules are by slag-transporting pipe by described
Blast furnace slag cooled hearth 11 grinds unit 5 into the clinker, enters the clinker recycling list finally by row's tube cell
Member 6 is prepared to zeolite CO2Adsorbent, while generate precipitation of calcium carbonate.
Adsorbent flow is：Zeolite passes through Pipeline transport to the CO2Adsorptive reactor 9 completes CO2Absorption, then passes through
Pipeline enters the CO2Desorption is carried out in desorption reactor 12, enters the CO further through pipeline afterwards2Adsorptive reactor 9
CO is carried out again2Absorption so cycles, loses CO2The zeolite of adsorption function is by the CO2Desorption reactor 12 is discharged.Flue gas
Flow, steel plant's smoke evacuation enter the CO by flue2Adsorptive reactor 9 completes CO2Clean flue gas after absorption reaches discharge
Device is discharged.
Air flow is：Hot-blast stove gas burner 18 is reached from the hot-air that the granulation unit 3 exports by air passage；Together
When, the hot-air that clinker grinds the discharge of unit 5 enters cooling of furnace slag burner hearth 11 by air passage, and high temperature furnace slag particle is flowed
Change, cooling of furnace slag burner hearth 11 discharges hot-air and exchanges heat to gas preheater 17 and combustion gas, and gas preheater 17 is defeated by hot-air again
Go out to hot-blast stove gas burner 18, another two-way air enters hot-blast stove by first air preheater 7, the second air preheater 8
Burner 18.
CO2Flow is：CO2As the CO2The fluidizing agent of adsorbent after being adsorbed in desorption reactor 12, with desorption
The CO of attached generation2The clinker recycling unit 6 is reached after the air preheater 7 cools down by air passage together,
Part CO is completed in the clinker recycling unit 62Utilization after, remainder purifies, stores by other means, profit
With.
Fuel gas flow path：Combustion gas reaches hot-blast stove gas burner and hot-air after gas preheater 17 and air heat-exchange heating
Burning, the high-temperature gas mixture of generation are subsequently fed into hot-blast stove.
The CO utilized based on blast furnace slag waste heat recycling and slag charge2Discharge-reducing method includes the following steps：
Step 1 crushes blast furnace slag, is granulated, and obtains blast furnace solid impurity particle；Blast furnace solid impurity particle is changed with fluidized wind
Heat obtains the first high-temperature gas；First high-temperature gas, which is sent in hot-blast stove gas burner, participates in combustion reaction.
Blast furnace solid impurity particle after heat exchange is discharged into desorption unit 4B by step 2, and desorption institute is provided for desorption unit 4B
Calorific requirement；
Blast furnace solid impurity particle after cooling is discharged to clinker and grinds unit 5 by step 3；
Step 4, clinker grind unit 5 and blast furnace solid impurity particle are milled into powder, are discharged to clinker recycling unit 6
In；Blast furnace slag powder is converted into zeolite and solid-state calcium carbonate by clinker recycling unit 6, and zeolite is transported to CO2It inhales
Coupon member 4A；
Pending flue gas is discharged into CO by step 52Absorbing unit 4A, by adjusting into exhaust gas volumn and by desorption unit
The amount of the high temperature zeolite of discharge causes CO2The temperature of absorbing unit reaches its suitable operating temperature, and zeolite adsorbs pending cigarette
CO in gas2Afterwards, clean flue gas is output to the second air preheater 8, with the air heat-exchange heel row in the second air preheater 8
Go out, the second air preheater 8 exports hot-air to hot-blast stove gas burner 18；It is adsorbed with CO2Zeolite be output to desorption unit
4B；
Step 6 provides thermal energy needed for desorption using blast furnace solid impurity particle for desorption unit 4B, is adsorbed with CO2Zeolite
CO is released in desorption unit 4B2Absorption, relieves CO2The zeolite of absorption returns to CO2Absorbing unit 4A is recycled；CO2Solution
Absorbing unit 4B exports hot-air to gas preheater 17；The rich CO that desorption unit 4B is generated2Gas is in the first air preheat
In device 7 with air heat-exchange；Rich CO after heat exchange2Gas is passed through in clinker recycling unit 6, and the first air preheater 7 is defeated
Go out hot-air to hot-blast stove gas burner 18；
Combustion gas is inputted gas preheater 17, CO by step 72The hot-air of desorption unit 4B outputs exchanges heat with combustion gas, will
The combustion gas of preheating and hot-air are output to hot-blast stove gas burner 18；The high-temperature gas mixture that hot-blast stove gas burner 18 generates is sent into hot wind
Stove 19.
In a particular embodiment, clinker recycling unit 6 includes calcium dissolvers, hydrothermal conversion device, carbonizer；Calcium is molten
It solves and organic acid is housed in device；
The rich CO that desorption unit 4B is generated2Gas in the first air preheater 7 with air heat-exchange；Rich CO after heat exchange2
Gas is passed through in carbonizer 16；Clinker grinds unit 5 and blast furnace solid impurity particle is milled into powder, and being discharged to be marked with certain density has
In the calcium dissolvers of machine acid, after blast furnace slag powder reacts with organic acid, calcium ion is extracted out, specific chemical equation
For：
CaSiO3+2CH3COOH→Ca2++2CH3COO-+SiO2+H2O
The leachate of calcium ions is transported to the carbonization that calcium ion is completed in carbonizer 16, remaining by magnesium, aluminium, silicon etc.
The solid residues of oxide composition are transferred in hydrothermal conversion device 15；
Add alkaline solution into hydrothermal conversion device 15, such as add concentration be 2.0~8.0g/L sodium hydroxide solution or
Potassium hydroxide solution, solid residues react generation zeolite with alkaline solution in the hydrothermal conversion device 15, zeolite are transported to
CO2Absorbing unit 4A；
Alkaline solution is added in into the carbonizer；Such as add the sodium hydroxide solution or hydrogen that concentration is 2.0~8.0g/L
Potassium oxide solution, alkaline solution and calcium ions leachate reaction after, then with CO2The carbonization of calcium ion is completed in gas reaction,
Form the solid-state calcium carbonate of recycling, remaining CO2Back to desorption unit, another part has been stored a gas part
Come, other purposes can be made.
Such as：Sodium hydroxide solution and the leachate of calcium ions reaction generation calcium hydroxide, calcium hydroxide and CO2Gas is anti-
The carbonization of calcium ion should be completed, specific chemical equation is：
CaCH3COO2+NaOH→2NaCH3COO+CaOH2
CaOH2+CO2→CaCO3+H2O
The above-mentioned specific embodiment of the present invention is the preferred embodiment of the present invention, can not to the claim of the present invention into
Row limitation, other any changes made without departing from technical scheme and equivalent replacement mode, are included in this
Within the protection domain of invention.
Claims (5)
1. a kind of CO utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system, including：Granulation unit (3), CO2Absorption is single
First (4A), desorption unit (4B), clinker grind unit (5), clinker recycling unit (6), the first air preheater (7)
Second air preheater (8) and gas preheater (17)；
The bottom input fluidized wind of granulation unit (3), the slag notch of granulation unit (3) connect with the slag inlet of desorption unit (4B)
It connects；Granulation unit (3) is for crushing blast furnace slag, being granulated, after obtaining blast furnace solid impurity particle and exchanging heat with fluidized wind, blast furnace slag
Particle is discharged into desorption unit (4B), and desorption institute calorific requirement is provided for desorption unit (4B)；
It is characterized in that:
CO2The adsorbent import of the adsorbent outlet connection desorption unit (4B) of absorbing unit (4A), CO2Absorbing unit (4A)
Adsorbent import connection desorption unit (4B) adsorbent outlet；CO2Absorbing unit (4A) sets gas inlet, CO2Absorption
Exhanst gas outlet connection the second air preheater (8) air inlet of unit (4A)；CO2Second adsorbent import of absorbing unit (4A)
Connect the zeolitic material outlet of clinker recycling unit (6)；
The air inlet connection clinker of desorption unit (4B) grinds the air outlet of unit (5), the air outlet of desorption unit (4B)
Connect the air inlet of gas preheater (17)；The gas outlet of desorption unit (4B) connects the air inlet of the first air preheater (7)
Mouthful；The slag inlet that the slag notch of desorption unit (4B) grinds unit (5) with clinker is connected；Desorption unit (4B) is provided with useless
Material outlet；
Clinker grinds unit (5) and is provided with air intlet, and clinker grinds the slag notch of unit (5) and clinker recycling unit
(6) feed inlet connection；Clinker recycling unit (6) is provided with precipitation of calcium carbonate outlet；
First air preheater (7) is provided with air inlet, the air outlet connection hot-blast stove gas burner of the first air preheater (7)
(18) air inlet；The air inlet of the gas outlet connection clinker recycling unit (6) of first air preheater (7)；
Second air preheater (8) is provided with air inlet, the air outlet connection hot-blast stove gas burner of the second air preheater (8)
(18) air inlet；Discharge clean flue gas in the gas outlet of second air preheater (8)；
Gas preheater (17) is provided with fuel gas inlet, the gas outlet connection hot-blast stove gas burner (18) of gas preheater (17)
Fuel gas inlet, gas preheater (17) air outlet connection hot-blast stove gas burner (18) air inlet, gas preheater (17)
High-temperature gas mixture is provided to hot-blast stove (19).
2. the CO according to claim 1 utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system, it is characterised in that：
Clinker recycling unit (6) includes calcium dissolvers, hydrothermal conversion device, carbonizer；Organic acid is housed in calcium dissolvers；
The slag notch that clinker grinds unit (5) is connected with the feed inlet of calcium dissolvers, and the discharge port connection hydro-thermal of calcium dissolvers turns
Change the feed inlet of device, the inlet of the liquid outlet connection carbonizer of calcium dissolvers；Alkaline solution is housed in hydrothermal conversion device；Hydro-thermal
The discharge port connection CO of converter2Second adsorbent import of absorbing unit (4A)；Alkaline solution is housed in carbonizer；Carbonizer
Gas outlet connection desorption unit (4B) air inlet；The air inlet of carbonizer connects the outlet of the first air preheater (7)
Mouthful.
3. the CO according to claim 1 or 2 utilized based on blast furnace slag waste heat recycling and slag charge2Emission-reducing system, feature exist
In：CO2Absorbing unit (4A) includes CO2Adsorptive reactor (9) and the first cyclone separator (10)；Desorption unit (4B) includes
Cooling of furnace slag burner hearth (11), CO2Desorption reactor (12) and CO2Discharger (13)；CO2Desorption reactor (12) is set
In cooling of furnace slag burner hearth (11)；First cyclone separator (10) is arranged on CO2At the gas outlet of adsorptive reactor (9).
4. the CO utilized based on blast furnace slag waste heat recycling and slag charge2Discharge-reducing method, it is characterised in that:Include the following steps：
Step 1 crushes blast furnace slag, is granulated, and obtains blast furnace solid impurity particle；Blast furnace solid impurity particle is exchanged heat with fluidized wind,
The first high-temperature gas is obtained, is subsequently passed in hot-blast stove gas burner；
Blast furnace solid impurity particle after heat exchange is discharged into desorption unit (4B) by step 2, and desorption institute is provided for desorption unit (4B)
Calorific requirement；
Blast furnace solid impurity particle in desorption unit (4B) is discharged to clinker and grinds unit (5) by step 3；
Step 4, clinker grind unit (5) and blast furnace solid impurity particle are milled into powder, are discharged to clinker recycling unit (6)
In；Blast furnace slag powder is converted into zeolite and solid-state calcium carbonate by clinker recycling unit (6), and zeolite is transported to CO2
Absorbing unit (4A)；
Pending flue gas is discharged into CO by step 52Absorbing unit (4A), zeolite adsorb the CO in pending flue gas2Afterwards, clean flue gas
The second air preheater (8) is output to, with being discharged after the air heat-exchange in the second air preheater (8), the second air preheater
(8) hot-air is exported to hot-blast stove gas burner (18)；It is adsorbed with CO2Zeolite be output to desorption unit (4B)；
Step 6, using blast furnace solid impurity particle for desorption unit (4B) provide desorption needed for thermal energy, be adsorbed with CO2Zeolite solving
CO is released in absorbing unit (4B)2Absorption, relieves CO2The zeolite of absorption returns to CO2Absorbing unit (4A) recycles；CO2Solution
Absorbing unit (4B) exports hot-air to gas preheater (17)；The rich CO that desorption unit (4B) generates2Gas is empty first
In air preheater (7) with air heat-exchange；Rich CO after heat exchange2Gas is passed through in clinker recycling unit (6), the first air
Preheater (7) exports hot-air to hot-blast stove gas burner；
Combustion gas is inputted gas preheater (17), CO by step 72The hot-air of desorption unit (4B) output exchanges heat with combustion gas, will
The combustion gas of preheating and hot-air are output to hot-blast stove gas burner (18)；The high-temperature gas mixture that hot-blast stove gas burner (18) generates is sent into
Hot-blast stove (19).
5. the CO according to claim 4 utilized based on blast furnace slag waste heat recycling and slag charge2Discharge-reducing method, it is characterised in that：
Clinker recycling unit (6) includes calcium dissolvers, hydrothermal conversion device, carbonizer；Organic acid is housed in calcium dissolvers；
The rich CO that desorption unit (4B) generates2Gas in the first air preheater (7) with air heat-exchange；Rich CO after heat exchange2
Gas is passed through in carbonizer (16)；Clinker grinds unit (5) and blast furnace solid impurity particle is milled into powder, is discharged to and is marked with a certain concentration
Organic acid calcium dissolvers in, after blast furnace slag powder and organic acid react, the leachate of calcium ions is transported to carbonization
The carbonization of calcium ion is completed in device (16)；Solid residues are transferred in hydrothermal conversion device (15)；
Into hydrothermal conversion device (15), addition alkaline solution, solid residues are anti-with alkaline solution in the hydrothermal conversion device (15)
Zeolite should be generated, zeolite is transported to CO2Absorbing unit (4A)；
Alkaline solution is added in into the carbonizer；Alkaline solution and the leachate of calcium ions reaction after, then with CO2Gas is anti-
The carbonization of calcium ion should be completed, forms the solid-state calcium carbonate of recycling.
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| CN109595947B (en) * | 2019-01-17 | 2023-10-03 | 苏州良造能源科技有限公司 | Industrial slag sensible heat recovery system and recovery method thereof |
| CN110982966B (en) * | 2019-11-20 | 2021-11-12 | 中山大学 | Multi-stage recovery system and method for blast furnace slag and coal gas waste heat |
| CN112058219A (en) * | 2020-09-17 | 2020-12-11 | 昆明理工大学 | Preparation method and application of blast furnace ferronickel slag-based zeolite molecular sieve |
| CN114432832B (en) * | 2021-12-31 | 2023-05-02 | 西安交通大学 | Waste heat driven air trapping CO in steel plant 2 System of (2) and CO 2 Is used in the method of using |
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| CN102424868A (en) * | 2012-01-12 | 2012-04-25 | 安徽工业大学 | Blast furnace smelting slag water quenching waste steam waste heat recovery system |
| CN102690910A (en) * | 2012-05-31 | 2012-09-26 | 四川川润股份有限公司 | Dry-method treatment and waste heat continuous utilization system for blast-furnace slag |
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| KR101159595B1 (en) * | 2010-10-27 | 2012-06-27 | 현대제철 주식회사 | Apparatus for waste heat recovery of furnace slag |
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| CN102424868A (en) * | 2012-01-12 | 2012-04-25 | 安徽工业大学 | Blast furnace smelting slag water quenching waste steam waste heat recovery system |
| CN102690910A (en) * | 2012-05-31 | 2012-09-26 | 四川川润股份有限公司 | Dry-method treatment and waste heat continuous utilization system for blast-furnace slag |
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